The Principles of Philosophy (René Descartes)

René Descartes' "The Principles of Philosophy" lays out a systematic understanding of the universe based on reason and scientific principles. He emphasizes that true knowledge must be certain and derived from clear, logical thinking. Descartes begins with doubt to find what cannot be questioned—most famously, "I think, therefore I am." From this foundation, he explores the nature of matter, space, and the relationship between mind and body. His work aims to establish a secure scientific philosophy rooted in rational inquiry, emphasizing that understanding the world involves both philosophical reflection and empirical investigation.